A FIELD MEASUREMENT SYSTEM FOR WIND ENGINEERING AND ANALYSIS OF TYPHOON CHARACTERISTICS BY ULTRASONIC ANEMOMETERS

Keywords

Abstract

A low-rise building and a tower were constructed near Shanghai
Pudong International Airport by East China Sea to investigate
characteristics of wind ﬁeld and wind pressure on the surface
of the roof. This paper ﬁrstly introduces the overview of the
ﬁeld measurement system and then presents the ﬁeld measurement
results of near-ground wind characteristics over a typical ﬂat area
near the Yangtze River estuary during typhoon HAIKUI. Variations of the wind characteristic parameters, such as mean wind
speed, longitudinal turbulence intensity, gust factor and turbulence
integral scale, along the height are analysed. It is found that
the neutral atmospheric stratiﬁcation (|z/L| ≤ 0.1) occurred in the
periods corresponding to the relatively high mean wind speed, and
z/L has greater dispersion when the wind speed is relatively low.
The dispersion of friction velocity is large when wind speed is
small, and its variation with the mean wind speed is not obvious, but when the mean wind speed is larger, the friction velocity increases signiﬁcantly with the mean wind speed. The measured mean wind speed proﬁle is in good agreement with power
and logarithmic law. Besides, the proﬁles of turbulence intensity,
gust factor and turbulence integral scale factor are presented and
empirical expressions are given by ﬁtting the proﬁle curve, which
is useful for wind-resistant design of engineering structures in the
future.